[nzlug] Telnet in all it's... hmm.... greatness?

[Kealey, Martin, ihug-NZ]

Nevyn wrote:
> 	( sleep 1
> 	  echo username ; sleep 1 ; echo password ; sleep 1
> 	  commandToTryAndStartPPP ; sleep 10 ; echo logout
> 	) |
> 	telnet $ROUTER
> 	kill `pidof telnet`
> I don't think this is such a good idea. Need to
> figure out how to a) exit cleanly or b) grab the PID of just this
> telnet session or c) to leave the session open and have the script
> just use that session everytime it wants to communicate with the
> router

<OB1>Use netcat, Luke</OB1>

Netcat automatically exits when the *network* connection closes -- which it generally will if send "logout".

It also doesn't need funny time-delays to get the input to go at the right time.

Apropos getting the pid:

	echo $blahblah | telnet $host &
	pid=$!
	echo do other stuff
	kill -HUP $pid

The "$!" gives you the PID of the most recently started background process.

(In the case of a pipeline, the PID of the right-most command, which is usually the one you want because it's output is what gets suspended.)

-Martin
-- 
(Apologies to the list for the ridiculous verbage that appears below this line; please remove it when quoting any reply.)
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